a******e 发帖数: 36306 | 1 【 以下文字转载自 Working 讨论区 】
发信人: anywhere (未明空间被hack了?), 信区: Working
标 题: Power Supply Engineer Opening (Austin, TX)
发信站: BBS 未名空间站 (Fri Apr 10 11:19:35 2009), 转信
刚一个老同事打电话说Hipro在找Power Supply Engineer,需要有一定Power Supply
Design的经验,工作地点在Austin, TX。
如果感兴趣,请跟我联系,并大致说一下你的背景。这个是我原公司客户招人,我也不
想随便推荐,谢谢。 |
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c*******r 发帖数: 275 | 2 农村待着也没啥啊,我想在农村待着,可惜没职位啊。
做power ic的大部分是学ic 的人,不是学power 的人。
就是学power 的人转做ic,也大部分是做小功率dcdc的人在转,你背景不太match。
另外尤其现在的形势下,少有公司愿意培养新人。
做大功率的看起来似乎机会少一些,但稳定,去GE,simens,ab,abb啥得挺好。 |
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w*****r 发帖数: 348 | 3 If a design is synthesized into gate level, how to get its power?
For example, in Design Compiler, we use command report_power, however, the
power is different if the toggle rate of signals are different. I am
confused now, how can we claim the power of a design at gate level?
Thanks |
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d****o 发帖数: 1112 | 4 我觉得做个懂power的system engineer比较好
懂power面就比较窄,但是做系统的懂power,那就是锦上添花。 |
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k*******3 发帖数: 6 | 5 目前有3个美国offer。一个是RFIC,方向暂定是做transceiver。另1个是power
management IC,应该是做DC-DC converter, LDO之类的. 学校都差不多,已不准备考
虑这一点。
和两个老师都聊过。也和他们的学生聊过。做RF的老师相对push一点,学生有怨言;做
power的老师相对nice一点,学生口碑很好。工作都还算比较好找;做RF出来的基本都
是engineering,做power的老师有几个学生走学术,剩下的是engineering。
本人对这两个方向都不是很了解,向大家请教一下了,该怎么选择,选择的时候应该主
要考虑什么?
多谢了。 |
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g****t 发帖数: 31659 | 6 我认为有可能作出比apple的ipod里面
power management更节能的power management.
不改其他部分.
你认为导致ipod耗电的愿意是power converter没设计好? |
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g****t 发帖数: 31659 | 7 chevy目前说,还是用LG的电池.八十个cell左右串联.电池最高4.x伏.
不管辅助电池什么的.只管电机驱动车这块,
chevy volt最大功率会高到60kW.
刹车造成充电的最大功率会达到20kW或者更高.
1分钟充放电最高会切换几十次.
全电驾驶时,平均功率如果按交通部的几个driving profile来算,
大概每小时平均会有40kw左右,不然做不到它标称的里程数.
这么高的功率,这么复杂的负载,
咱这版上,恐怕也就您老这种大拿,敢于说 power 部分“没问题”,
"不关键".
目前来说EV的power management做phd论文是绰绰有余的。
就是你说的电力电子的学术会,这也是很经常的topic.
你以为它是查查datasheet就能做出来的小家电的电源?
(别说EV这么复杂的负载了,就是热处理用或者焊接用的60kw这级别的炉子,
如果你能做到80%的加热效率。我出20万刀收购图纸---你可以mark my words.
)
另外不妨说说你对pirus知道些什么.给大家展示下你有多内行.
提醒你句,这是两种power要求完全不同的车.
GM要出的volt,我确 |
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a*m 发帖数: 6253 | 8 The successful candidate will be responsible for developing and integrating
software drivers for power management and audio products. We develop and
market world-class high integration power management ICs and Analog Baseband
ICs (power + audio).Our success is driven by individuals with an
entrepreneurial spirit and a desire to see their hard work have a direct
impact on the Company’s results. Candidates must be highly self-motivated
and willing to work in Sunnyvale or San Diego, California.
Dut |
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p***e 发帖数: 472 | 9 High-frequency, high-power power supply is a cutting-edge area. It combines the skills of device, power electronic control, EMI, analog and digital hardware implementation, etc. At the moment, it is mostly at early stage and only a few industrial applications. But it should be fun for research, and have more potential applications in future. |
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d**g 发帖数: 1031 | 10 System Engineer Roles and Goals
1. Building a strong three-person team: Lead IC designer, system engineer
, and local sales and FAE for sponsored customers.
2. Defining new products
a. As a new product development owner and main driver both in technical
specs and business justification, proactively work with marketing, sales,
field engineers, and customers to find out new business opportunities.
b. Generate the preliminary product preview (3 pages: key features, Pin
out and descripti... 阅读全帖 |
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c****9 发帖数: 942 | 11 说实话, 我个人觉得现在POWER方向似乎大有焕发新活力新气象的好专业, 不知道大
家怎么看。
有没有人出来现身说法一下, 工资待遇, 好公司集中地区, 以及工作中感受等问题 |
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s****s 发帖数: 50 | 12 【 以下文字转载自 JobHunting 讨论区 】
发信人: shenms (shenms), 信区: JobHunting
标 题: Power electronics engineer research position
发信站: BBS 未名空间站 (Fri Feb 25 21:49:43 2011, 美东)
Power electronics engineer research position in corporate research center,
multiple opening
skill set (any of the following):
DSP/FPGA programming
power converter design
motor control
Modeling and simulation
motor design
Requirement:
PhD or MS with related experience
If interested, please send resume to c***********[email protected] |
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f******d 发帖数: 6361 | 13 freescale do not do much analog/power electronics in headquarter at all, nor
do TI,Qualcomm,Maxim in austin, ibm,intel,amd do digital/vlsi, intel,amd
may have some analog in austin. only cirrus does analog/power, but it is
just little baby, so not too many. so called the silicon hill is focking
joke for analog/power electronics guy. |
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z*********e 发帖数: 6 | 14 We are looking for a short-listed candidate for a job opening in embedded
firmware design for power electronics systems.
If you are looking for a job offer, and if you have years' experience in
embedded firmware (DSP/MCU) design and solid backgrounds in power
electronics (topology analysis), you may send your resume to: zebrayeh@yahoo
.com
Location of this job is in the united states. In addition, fresh graduates
with M.S.E.E, or even outstanding graduates with B.S.E.E degree from an ABET
colleg... 阅读全帖 |
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l**********n 发帖数: 303 | 15 Hi all,
Is there anyone familiar with Matpower?
I successfully handled the power flow on transmission systems (like case14.m
) using matpower. Now I need to run power flow on a distribution grid with
some DGs and microgrids and came up with some problems.
I found a IEEE distribution test system from http://www.ewh.ieee.org/soc/pes/dsacom/testfeeders/index.html. But I don't know for sure the data provided by this website, and how it can be converted to the matpower data format like in the case14... 阅读全帖 |
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V*******5 发帖数: 842 | 16 前几天on campus面试过了,拿到on-site,让我自己选时间12月或者1月。我选的一月
。职位是Design Engineer,一个IC公司,方向是power management。
请教版上高手如何准备on-site,是侧重看Analog IC的东西还是Power electronics的
东西?
(目前打算把拉扎维那本书的课后题做2遍然后在把学过的power 的东西好好复习下。)
先谢过! |
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g******u 发帖数: 3060 | 17 for top power group, you will always find a job.
there are companies like Power Integrations whose 90% products are flybacks.
But it's very boring to just stick with one topology or even just power
electronics. |
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k*******d 发帖数: 1523 | 18 做power的比较好找工作的...
一堆猎头经常打电话问我要不要去做power.. 可惜俺不是做power的.. |
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o*b 发帖数: 70 | 19 EE fresh Master,
硕士做的是关于电力电子的方向,对这个方向还是挺感兴趣
但是没有实习经验,hands-on的经验也不多,大多数学习都是理论和仿真,找工作比较
吃力
怕找不到工作,还不想那么快回国,于是想先申请个PhD,再一边找工作,如果找到工
作偏向工作
Power Electronics 和 Power system哪个方向以后就业发展比较好呢?
谢谢指点。 |
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o*b 发帖数: 70 | 20 EE fresh Master,
硕士做的是关于电力电子的方向,对这个方向还是挺感兴趣
但是没有实习经验,hands-on的经验也不多,大多数学习都是理论和仿真,找工作比较
吃力
怕找不到工作,还不想那么快回国,于是想先申请个PhD,再一边找工作,如果找到工
作偏向工作
Power Electronics 和 Power system哪个方向以后就业发展比较好呢?
谢谢指点。 |
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g*******7 发帖数: 820 | 21 本科国内学POWER的。。。MASTER为了奖学金跳去了普通的EE,现在为了工作又在搞制
造业的control engineer, 现在很想跳回POWER SYSTEM....不知道有没有机会啊。。
。是不是又要再去读一个POWER的MASTER吗? |
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e********t 发帖数: 144 | 22 https://schneiderele.taleo.net/careersection/2/jobsearch.ftl
Senior Power Systems Design Engineer
-Full-time
United States-Massachusetts-Billerica
Requisition ID 000A2D
May 18, 2013
REQUIREMENTS:
- Technical Undergraduate degree and Master-level degree in Electrical
Engineering preferred; will also consider a multi-disciplined background
with power systems design experience
- 4+ years of experience, Professional Engineer required (or an additional 3
-4 years of work experience)
- Knowledge ... 阅读全帖 |
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g*******7 发帖数: 820 | 23 本人很菜鸟.....坛子上各位请不要见笑
国内本科是power system的, 后来来美国读了master但是和power没关系,而是图像处
理, 就是用matlab编编程,很简单的毕业设计...然后就在当地的公司找到工作, 但
是方向又和学得完全不一样, 现在在公司title虽然也是electrical engineer,但是
做的东西都是些工厂里面control的, 比如说PLC啊,CNC啊,ROBOT啊 之类的,也会协
助maintanance 对machine trouble shooting。 感觉基础好薄弱, 这些都需要有很强
的硬件知识, 但是我就大二的时候摸了下那些电路元件, 早就忘光了.... 现在连读
懂schematic都有点困难, 总之做的各种不得心应手....又没人有点拨
因为年过27, 不得不考虑到以后要是有小孩子, 制造业做这种工作好辛苦, 天天都
要在车间, 所以在犹豫要不要再去读个本科老本行搞电力, 本科毕业已经五年了,基
本上知识学过的都忘了一大半了。。。。 不知道值不值得? power如果没有绿卡,又
没有这方面的工作经历,好找工作吗?
还是继... 阅读全帖 |
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h**********o 发帖数: 154 | 24 如果现在在考虑要不要读Power Electronics 要慎重考虑一下。Power Electronics 现
在非常缺有经验人才,但是Entry Level的很快就会饱和了。很多大的公司现在都把具
体的设计外包,一个产品设计出来可以用好多年而不用大规模的改进,所以并不需要太
多的Power Electronics Engineer, fresh的更不需要了。 而且这些跟新能源相关的公
司在未来几年肯定要经历一次洗牌。前途未卜给大家提醒一下。个人观点,仅供参考。 |
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h**********o 发帖数: 154 | 25 如果现在在考虑要不要读Power Electronics 要慎重考虑一下。Power Electronics 现
在非常缺有经验人才,但是Entry Level的很快就会饱和了。很多大的公司现在都把具
体的设计外包,一个产品设计出来可以用好多年而不用大规模的改进,所以并不需要太
多的Power Electronics Engineer, fresh的更不需要了。 而且这些跟新能源相关的公
司在未来几年肯定要经历一次洗牌。前途未卜给大家提醒一下。个人观点,仅供参考。 |
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n********9 发帖数: 23 | 26 power ic是指power management芯片。。属于电力电子的范畴。。跟你的power system
不是一个东西。。
我觉得你最后决定转行做软件。那就刷刷题吧。。去那几个大的。。不然有啥意思?
不过换我的话。我会先在自己的本行业先做几年。。 |
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D***4 发帖数: 84 | 27 请问现在还有效吗?我在apple网站上找到几个power electronics的职位,但我在学校
里做的大多是high power, high voltage的power electronics,不知道和apple要招的
match不match
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/* ]]> */ |
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J********t 发帖数: 240 | 28 公司现在有lead power electronics engineer的职位。需要你有PCBA/Altium的工作经
验,最好有PWM control, power converting, high power, high voltage方向的背景。
Communication(RS232, RS485), EMI, Embedded C, PV system加分。
要求master+3years工作经验,最好有一定supervise经验,这个职位有2~3个direct
reports,如果没有相应经验,也可以面试senior title,以后考虑升lead。
如果你是认真考虑的话,可以直接发信给我,附上你的简历或者linkedin profile。
公司的地点是在波士顿北郊。 |
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e*****l 发帖数: 2 | 29 曹老师很赞的,友情帮贴。
Title: ECE PhD RA Opening@NDSU Spring 16
Research Assistant (RA) positions starting from Spring’ 16 are available
for self-motivated students who are interested in pursuing Ph.D. degree in
Electrical and Computer Engineering at North Dakota State University, Fargo,
ND. The successful candidates will have the opportunity to do high-quality
research with Dr. Cao in power electronics and motor drive, renewable energy
power systems, plug-in/hybrid/battery electrified vehicle, wide bandg... 阅读全帖 |
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h********t 发帖数: 555 | 30 Power IC 算电力电子,还是属于电子类,和 power没啥关系。power是高压电力系统,
电网。 |
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e*r 发帖数: 1121 | 31 【 以下文字转载自 Engineering 讨论区 】
发信人: ear (猪头洗心革面), 信区: Engineering
标 题: power spectrum densities and power spectrum
发信站: BBS 未名空间站 (Fri Apr 20 20:59:03 2012, 美东)
谁能讲讲两个各用在什么地方,或是在什么情况下,用其中一个?
定义计算公示我知道,但是这两个在什么情况下,其中一个更proper?
谢谢! |
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S*M 发帖数: 104 | 32 Hi there,
Sorry for bothering. I have a question about E-beam heating on STM machine.
We currently plan to use E-beam heating at the machine but it seems like the
machine has only radiative heating function. Now we need to modify the
power supply and filament a little bit to realize E-beam heating. The way is
to float the current power supply and bias the filament. Does anyone have
relative experience before? It will be perfect if you also use Omicron's
STM or Delta's power supply. Thanks a lot |
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S*M 发帖数: 104 | 33 【 以下文字转载自 NanoST 讨论区 】
发信人: STM (STM), 信区: NanoST
标 题: floating power supply
发信站: BBS 未名空间站 (Mon Jul 2 11:05:23 2007)
Hi there,
Sorry for bothering. I have a question about E-beam heating on STM machine.
We currently plan to use E-beam heating at the machine but it seems like the
machine has only radiative heating function. Now we need to modify the
power supply and filament a little bit to realize E-beam heating. The way is
to float the current power supply and bias the filament. Does anyone |
|
f********h 发帖数: 146 | 34 看了很多很多女孩在网上贴的家庭故事,关于家庭暴力,关于男人忘记了浪漫,关于男
人控制了认可与被认可的权力。许许多多的哀怨,我们总是想也想不清楚。
关于这些家庭的冲突,对以往爱情的质疑,对家庭的失去信心,应该可以从多个角度去
解读。比如行为科学,心理学,甚至纯粹的经济学。。
我就先来试着从一个角度来和大家讨论: Power and influence.
Power的概念就是:Power refers to a capacity that A has to influence the
behavior of B so that B does something he would not otherwise do. Three
elements: potential/ dependence/ discretion (例如F1(H1)控制F2(H4)的行为
,让其做家里全部的家务,事后不与表扬和认可,让人觉得无比委屈。 或者平时不许
老婆给丈母娘寄钱,不许老婆shopping等等等等)
为什么会出现这种情况?其实就是F1或者H1在家里有更大的权力,他们有意或者无意的
控制了MM们的行为。如果公 |
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g******n 发帖数: 339 | 35 α 是一个预先设定的type I error阈值。这个α-level决定了一个decision rule,使
得当null hypothesis 为真的时候被拒绝的概率不超过α。β和1-β(power)当然也
和这个α-level有关,因为这个decision rule也决定了β和1-β。但是,这种关系不
是你所说的这种简单关系。比如说,你要做一个t test:u=0 vs. u>0. 你选择α=0.05
,表示你希望type I error不超过0.05。这个决定了你的decision rule:reject the
null hypothesis if the t test statistic t=x_bar/sd_err>t(1-α). where
x_bar=sample mean,
sd_err=sample standard error/sqrt(n),
t(1-α)=(1-α)upper quantile of the t-distribution with df=n-1.
那么,在这种情况下,你的power (1-β)又是什么?注意一般来说,这个power 是指
在al |
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o******6 发帖数: 538 | 36 ☆─────────────────────────────────────☆
Internhunter (什么) 于 (Mon Mar 16 04:18:43 2009) 提到:
谢谢
☆─────────────────────────────────────☆
kevintang (kevinuk) 于 (Mon Mar 16 07:11:21 2009) 提到:
不是有很多参数估计方法吗?
☆─────────────────────────────────────☆
davfox121 (davfox) 于 (Mon Mar 16 09:28:39 2009) 提到:
use proc power
☆─────────────────────────────────────☆
sir ( 郎 ) 于 (Mon Mar 16 17:21:32 2009) 提到:
proc power may only give the power to compare 2 survive curves
that is not the covariate |
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h****s 发帖数: 16779 | 37 Still do not understand what you are going to do.
Maybe you can give a makeup data example about the data structure and what
you want to test. You may do power analysis for this data first. And the
sample size calculation will easily follow.
The power and sample size analysis can be carried out only after the test
has been decided. Simply saying "need to conduct a power analysis" without
what kind of test makes no sense. |
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w********u 发帖数: 328 | 38 I want to calculate the POWER.
SAS code:
proc power;
onesamplemeans
mean = 8
ntotal = 150
stddev = 40
power = .;
run;
This method makes sense when it follows normal dist., but my case is that
the sample size is extremely small but the population is very large, i can't
say that it follows normal dist., i assume it doesn't follow any particular
dist. but i haven't got the data yet, i wonder which method could be used
in this case and what's the sample size needed to conduct any analysis. for
examp |
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l**********o 发帖数: 9952 | 39 我没怎么学过statitics,可能问题很傻,但现在没人可以问,大包子请教(有答就有包子,答的多答的好的包子大):
我有一组8个数据,say (1.00,1.05,1.10,0.97,0.82,1.03,0.99,0.95)
我想做power analysis, to calculate the required sample size to detect a 10% change (is this termed as effect size?) with 95% confidence (is this termed as significance criterion?) with power of 0.8 (is this usually just fixed at 0.8?)
说得也许不清楚,换言之,我这8个是已测量的normal group,是一个group里的,用来作为normal mean and standard deviation 这些标准的.
We want to determine the number of patients and controls (assumi... 阅读全帖 |
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g********r 发帖数: 8017 | 40 把这八个数的mean和sd算出来,随便找个sample size计算器,有钱买PASS,没钱网上有的是。比如http://www.stat.uiowa.edu/~rlenth/Power/
group 1 mean = sample mean
group 2 mean = sample mean*1。1
equal sd, both = sample sd
alpha = 0.05
beta = 0.8
group size r=1
然后求sample size就得了。
有包子,答的多答的好的包子大):
% change (is this termed as effect size?) with 95% confidence (is this
termed as significance criterion?) with power of 0.8 (is this usually just
fixed at 0.8?)
来作为normal mean and standard deviation 这些标准的.
same number of participants in disease... 阅读全帖 |
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a****m 发帖数: 693 | 41 the power depends on
the structure of the experiment
the method for analyzing the data
the size of the true underlying effect
the variability in the measurement
the chosen significance level
你说的这个beta应该是与true underlying effect相关吧,正常的power设定在80-90%
之间。 通过power计算beta的范围。 |
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s**m 发帖数: 340 | 42 the studied population has 114 patients. Univariate cox model of my index
results hazard ratio of 2.6 (p<0.001). I put the index into a multivariate
cox model with 5 other variables, and results a hazard ratio>4 (P<0.02).
However, a collaborator criticized that the univariate results does not have
enough statistical power to justify the use of multivariate model. Does
that make sense? I am not an expert in statistics. I just use epi-info to do
the analysis, and it does not give me this statistic... 阅读全帖 |
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z********n 发帖数: 710 | 43 请教关于power analysis的应用。现在有各个州的sample size,想计算这些sample
size是否足够大能得到.9 以上的power.
需要参数中significant level可以定,statistical test也能定,但是不知道怎么样
来定effect size和variability? 没有conduct study之前,如果定effect size和
population variability呢?有没有什么estimate的方法。谢谢了。
另外,做这个test的目的是告诉一些不懂statistics的领导,这个study不能run by
state,power不够,只能run by national level。因为现在的sample size 还是一个
estimation,具体run study还有很多的exclusion criteria要run,所以final sample
size 会更小。
知道版上有很多牛人,谢谢大家的帮助了。 |
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j*********1 发帖数: 21 | 44 如题。感觉principal component analysis 在我这个field还算比较新的方法。不知道
在座牛人有没有做过他的power analysis. 请问它有比较conventional 的power
analysis方法吗? Pca算出来后打算放进regression model里面。是不是只能做
regression model的power analysis啊。
新人实在没有包子,望各路牛人不吝赐教。小女子这厢有礼啦. |
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n****t 发帖数: 182 | 45 It depends...
If your interim analysis is futility analysis, by definition, you may
wrongly terminate the experiment when your H1 is true. This increases the
type II error, which lowers the power. But if your trial designed correctly,
this can be adjusted (for example, increase sample size). For example, beta
-spending method.
If your interim analysis is efficacy analysis, you'll have more chances to
claim efficacy and this inflates type I error and shrink type II error. Your
power hence increas... 阅读全帖 |
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l******o 发帖数: 3764 | 46 本人不懂统计,能找到的Literature里的数据和俺仅会的那几个标准的power analysis
公式都对不上,晕了,请牛人帮忙
1.reference paper: n=200, 其中nA=26, nb=174, outcome mu_A/mu_B=12.6 (95%CI 3
.39-46.7), p=0.0002
H0: mu_A/mu_B=1
我的sample n=60, 假设一样的frequency, nA=8, nB=52, 一样的effect size和SD,
alpha=0.05, power是多少呢?
2.(和1不相关)reference paper只有个box plot和p(见插图), 另外说明了这个p是
用nonparametric two-sample t test算的。
同样,假设我的sample size =60, same frequency (then TT=54, TG+GG=6), effect
size and SD, then power=?
图例如下:The (+) sign and line inside each box indicat... 阅读全帖 |
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c******n 发帖数: 4965 | 47 someone posted http://www.mitbbs.com/article_t/SanFrancisco/34288387.html
and ****called on net vigilante** to form a "华人惩奸团" to harm the 2
women whistle blowers who shed light on some real life political candidate
in a recent local election in Cupertino. The board admin fatcat happens to
be in real life to be very closely associated with the candidate, this is a
well known fact. fatcat is takes important positions in the real life
political organization UAAFA, which that candidate helped foun... 阅读全帖 |
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c******n 发帖数: 4965 | 48 someone posted http://www.mitbbs.com/article_t/SanFrancisco/34288387.html
and ****called on net vigilante** to form a "华人惩奸团" to harm the 2
women whistle blowers who shed light on some real life political candidate
in a recent local election in Cupertino. The board admin fatcat happens to
be in real life to be very closely associated with the candidate, this is a
well known fact. fatcat is takes important positions in the real life
political organization UAAFA, which that candidate helped foun... 阅读全帖 |
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i*********5 发帖数: 19210 | 49 【 以下文字转载自 Cycling 讨论区 】
发信人: wuyan (wuyan), 信区: Cycling
标 题: First hands-on look & rides with the Garmin Vector power meter
发信站: BBS 未名空间站 (Wed Aug 7 11:13:51 2013, 美东)
$1699 Garmin Vector power meter
dcrainmaker的评测出来了。
http://www.dcrainmaker.com/2013/08/hands-on-garmin-vector.html
发信人: wuyan (wuyan), 信区: Cycling
标 题: Re: First hands-on look & rides with the Garmin Vector power m
发信站: BBS 未名空间站 (Wed Aug 7 12:44:04 2013, 美东)
几点读后感。
1、Metrigear在被garmin收购之前,准备选用Speedplay pedal脚踏系统,不过最后改
用了LOOK ... 阅读全帖 |
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r*****g 发帖数: 9999 | 50 【 以下文字转载自 Automobile 讨论区 】
发信人: realbug (WA), 信区: Automobile
标 题: What FWD car has best power to weight ratio?
发信站: BBS 未名空间站 (Thu Jun 14 16:23:08 2007)
Cars ranked by Weight/Power ratio. Generally speaking, cars with smaller
Weight/Power ratio accelerates faster. But tires and transmission grearing
also make big difference.
LB / HP Year Make Model Trim Engine Liters HP Torque Weight
11.5 2007 Chevrolet Monte Carlo SS V-8 5.3 303 323 3489
11.8 2008 Nissan Altima 3.5 SE V-6 3.5 270 258 3186
11.9 |
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